Move to using Amazon Signer, rather than reimplementing.

lib/aws_paa/client.rb

@@ -1,8 +1,33 @@
-require 'rest-client'
+require 'http'
 
 module AwsPaa
   class Client
-    def initialize(:access_key, :secret_key, :marketplace, partner_tag: nil, partner_type: 'Associates')
+    attr_accessor :marketplace, :partner_tag
+    attr_reader :partner_type, :access_key, :secret_key
+
+    def initialize(access_key:, secret_key:, marketplace:, partner_tag: nil, partner_type: 'Associates')
+      raise ArgumentError unless MARKETPLACES.keys.include?(marketplace.to_sym)
+      @access_key = access_key
+      @secret_key = secret_key
+      @marketplace = MARKETPLACES[marketplace.to_sym]
+      @partner_tag = partner_tag
+      @partner_type = partner_type
+    end
+
+    def get_items(item_ids: )[]
+      Request.new(client: self).get_items(item_ids: item_ids)
+    end
+
+    def get_variations(asin: )
+      Request.new(client: self).get_variations(asin: asin)
+    end
+
+    def search_items(keywords: )
+      Request.new(client: self).search_items(keywords: keywords)
+    end
+
+    def get_browse_nodes
+      Request.new(client: self).get_browse_nodes(keywords: keywords)
     end
   end
-end
+end